This game has a very simple cheat. During the very begining of the third repeat chapter you will encounter harder enemies. When you find the combat shotgun save your bullets. When you reach the theater room and the metal pipes pop out the ground automatically aim at full and shoot directly at it. Aim for the bottom. This will help speed up the process.

The game is such that you cannot find all the pages in one go.... you need to play the whole game a total of three times during which you can collect new pages from the same areas and get the total pages to 53 (yup there's only 53 in the entire game)....